<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>if_条件分支语句</title>
</head>
<body>
<script>
    var score = 69;
    if (score > 60) {
      console.log('及格了');
    }
    else if(score > 80) {
      console.log('不错不错');
    }
    else if (score > 90) {
      console.log('真牛逼');
    }
    else {
      console.log('你个废物');
    }
</script>
</body>
</html>